LM3503SQX-44

LED Driver IC Overview

The LM3503SQX-44 is a dual-output DC-DC boost regulator IC designed for LED driving applications. It integrates high-side N-channel switches and supports analog and PWM dimming. The device operates with an input voltage range of 2.5V to 5.5V and delivers up to 750mA switch current. It features a fixed switching frequency of 1MHz and provides two independent constant current outputs. The component is housed in a 16-WQFN (4x4) package and functions within a temperature range of -40°C to +85°C.

LED Driver IC Feature Summary

• Dual-output topology for simultaneous multi-display or multi-zone LED driving
• Integrated high-side N-channel power switches for efficient step-up conversion
• Supports both analog and pulse-width modulation (PWM) brightness control methods

LED Driver IC Applications

• Mobile device backlight systems
• Portable electronic display illumination
• Multi-segment LED indicator arrays

LED Driver IC Procurement Notes

Verify the specific suffix '44' against official Texas Instruments documentation to confirm output voltage specifications and pinout configuration. Ensure the ordering part number matches the exact package variant required for your PCB layout. Cross-reference RoHS compliance status and environmental certifications directly with the manufacturer's latest datasheet before finalizing procurement orders.

LED Driver IC Selection Notes

Select this component when designing circuits requiring two independent boosted LED channels from a single low-voltage source. Consider the 1MHz switching frequency for minimizing external passive component size. Evaluate thermal performance requirements based on the 16-WQFN package's thermal dissipation capabilities under maximum load conditions.

LED Driver IC Part Context

This device belongs to the LM3503 series of LED drivers from Texas Instruments. It shares functional similarities with other members like the LM3503SQ-16 but differs in output voltage ratings and internal regulation settings. The series is optimized for portable electronics where space efficiency and power management are critical design constraints.

LED Driver IC Replacement Considerations

Public confirmed substitute part numbers are not available in the provided data.